JP4414894B2 - A multi-part cooled piston used in internal combustion engines - Google Patents

A multi-part cooled piston used in internal combustion engines Download PDF

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Publication number
JP4414894B2
JP4414894B2 JP2004557766A JP2004557766A JP4414894B2 JP 4414894 B2 JP4414894 B2 JP 4414894B2 JP 2004557766 A JP2004557766 A JP 2004557766A JP 2004557766 A JP2004557766 A JP 2004557766A JP 4414894 B2 JP4414894 B2 JP 4414894B2
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JP
Japan
Prior art keywords
piston
part
lower part
upper part
cooling passage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2004557766A
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Japanese (ja)
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JP2006509152A (en
Inventor
メスマー ディーター
シャープ ライナー
Original Assignee
マーレ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングMAHLE GmbH
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Publication date
Priority to DE2002157022 priority Critical patent/DE10257022A1/en
Application filed by マーレ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングMAHLE GmbH filed Critical マーレ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングMAHLE GmbH
Priority to PCT/DE2003/003170 priority patent/WO2004053319A1/en
Publication of JP2006509152A publication Critical patent/JP2006509152A/en
Application granted granted Critical
Publication of JP4414894B2 publication Critical patent/JP4414894B2/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons
    • F02F3/16Pistons having cooling means
    • F02F3/20Pistons having cooling means the means being a fluid flowing through or along piston
    • F02F3/22Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons
    • F02F3/0015Multi-part pistons
    • F02F3/0023Multi-part pistons the parts being bolted or screwed together

Description

  The invention relates to a cooled piston comprising a plurality of parts for use in an internal combustion engine of the type described in the superordinate concept part of claim 1.

  A piston consisting of an upper piston part and a lower piston part for use in a diesel engine is known from EP-A-0604223. When the piston is assembled, the piston upper part is screwed to the piston lower part through a threaded pin provided in the center of the piston upper part and a threaded hole machined in the piston lower part. In this case, in order to achieve a permanent assembly coupling portion, it is necessary to fix the position of the threaded portion with a lock nut. In this case, only a short part of the threaded pin appears between the pin bosses when the piston is assembled, which makes it difficult to screw the lock nut into this part.

  Starting from here, the object of the present invention is to improve the upper part and the lower part of a cooled piston consisting of several parts, so that a simple assembly of the piston upper part to the piston lower part It is to be possible without the additional use of nuts or other positioning means.

  This problem is solved by the features described in the characterizing part of claim 1. This causes a thin area with a threaded hole in the lower part of the piston to bulge in the shape of a disc spring when the upper part of the piston is screwed onto the lower part of the piston. It is achieved that the crested pin is subjected to a tensile stress that creates a permanent assembly connection between the piston upper part and the piston lower part.

  In the following, embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1 shows a piston 1 to be cooled which consists of a plurality of parts, that is to say a cooled assembly piston 1. The piston 1 comprises a piston upper part 2 having a combustion cavity 3 and a ring wall 4 with a ring part 5, and a piston lower part 6. The lower piston portion 6 has a box-shaped piston skirt 7 and two pin bosses 8 each having a pin hole 9 connected to the piston skirt 7 for receiving a piston pin (not shown). And have. The piston upper portion 2 and the piston lower portion 6 partition the outer annular cooling passage 10 and the inner cooling passage 11 disposed concentrically with the cooling passage 10. In this case, the outer cooling passage 10 has at least one inflow opening 12 for introducing cooling oil, and is connected to the inner cooling passage 11 via at least one overflow passage 13. The overflow passage 13 may be formed as a hole. In this case, for example, two overflow passages 13 located on opposite sides may be provided. The inner cooling passage 11 has at least one outflow hole 14. Through this cooling hole 14, the cooling oil can flow out from the inner cooling passage 11.

  In this case, the piston upper part 2 is on the one hand an annular support rib 17 of the piston lower part 6 via an annular mounting surface 15 arranged on the opposite side of the piston cavity 2 from the combustion cavity 3. Is supported on the upper mounting surface 16 and on the other hand on the upper cross section 19 of the annular support web 20 of the piston lower part 6 via the cross section 18 located below the ring wall 4. Has been. In this case, both mounting surfaces 15 and 16 form an inner mounting portion 21 which is flat and horizontally arranged or is formed in a roof shape or a dish shape. The outer mounting portion 22 is formed coaxially and horizontally with respect to the inner mounting portion 21 or is also formed in a roof shape or a dish shape.

  Since the support web 20 is formed in a step shape, the piston upper portion 2 is connected to the piston upper portion and the piston lower portion via a cylindrical notch 23 processed on the inner surface of the lower portion of the ring wall 4. It can be centered by the inner wall of the cylindrical notch 23 contacting the cylindrical end face 24 of the support web 20 during assembly with the part. In this case, the inner diameter of the cylindrical notch 23 is equal to the outer diameter of the cylindrical end surface 24 of the support web 20 by an error dimension that ensures a problem-free assembly of the upper portion 2 to the lower portion 6. It is necessary to be larger than.

  On the opposite side of the combustion cavity 3, the piston upper part 2 has a pin 26 arranged centrally and coaxially with the longitudinal axis 25 of the piston 1. The end 27 of the pin 26 has a thread 28. A region 31 between the annular support ribs 17 of the lower piston portion 6 that partitions the inner cooling passage 11 together with the upper piston portion 2 is formed relatively thin, and the longitudinal axis of the piston 1 is at the center thereof. A hole 29 arranged coaxially with respect to 25 is provided. The hole 29 has an internal thread 30 that fits into the thread 28 of the pin 26.

  This makes it possible for even the threaded pin 26 of the piston upper part 2 to be screwed into the threaded hole 29 of the region 31 when the piston 1 is assembled. In this case, due to the elasticity of the relatively thin region 31, this region 31 is deformed like a disc spring when assembled by screwing the piston upper portion and the piston lower portion, and the threaded hole 29 in the region 31 is formed. The inner central part provided swells in the direction of the piston upper part 2. In addition, the unreduced reduced diameter shaft portion or the fatigue prevention shaft portion of the threaded pin 26 is extended during assembly. Thereby, a further improvement in the certainty of the sitting of the piston upper part 2 on the piston lower part 6 is achieved. In this case, not only the mounting surfaces 15 and 16 of the inner mounting portion 21 but also the cross sections 18 and 19 of the outer mounting portion 22 are pressed against each other. As a result, the inner and outer cooling passages 10, 11 are sealed. This increases the strength of the assembly of the piston upper part and the piston lower part sufficiently such that no additional nuts or locknuts are needed to achieve a permanent assembly connection. It has been tried and found that sufficient preloading or preloading of both parts of the piston is guaranteed under all possible operating conditions.

  The piston upper part 2 may be made of an oxidation-resistant and / or heat-resistant material. Generally, steel containing 4% or more chromium is used. This steel consists of a chemically stable steel material group according to DIN EN 1000027-2 (steel group-number 1.4x xx), for example a heat-resistant stainless steel, and an alloyed tool steel material group, for example an alloy. Made of heat-treated steel.

  The lower piston portion 6 is made of precipitation hardening type ferritic to pearlite steel or heat treated steel. In this case, the steel quality 38MnVS6 or 42CrMo4 is generally used (according to German steel-iron material table 101).

1 is a sectional view of a piston according to the present invention, a left half is a half sectional view of a piston viewed in a pin direction, and a right half is a half sectional view of a piston viewed in a lateral pressure-opposite pressure direction. It is.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 piston, 2 piston upper part, 3 combustion cavity, 4 ring wall, 5 ring part, 6 piston lower part, 7 piston skirt, 8 pin boss, 9 pin hole, 10 cooling passage, 11 cooling passage, 12 inflow opening, 13 Overflow passageway, 14 outflow hole, 15 mounting surface, 16 mounting surface, 17 support rib, 18 cross section, 19 cross section, 20 support web, 21 mounting portion, 22 mounting portion, 23 notch, 24 end surface, 25 Longitudinal axis, 26 Threaded pin, 27 End, 28 Thread, 29 Threaded hole, 30 Female thread, 31 Area

Claims (1)

  1. A piston to be cooled (1) consisting of a plurality of parts for use in an internal combustion engine, comprising a piston upper part (2) with a ring wall (4) and a ring part (5), and a piston lower part (6 The piston lower part (6) is concentric with the piston upper part (2) and the outer annular cooling passage (10), and further concentric with the cooling passage (10). A piston-shaped piston skirt (7) with two pin bosses (8) joined to each other. A threaded pin in which the piston upper part (2) is arranged coaxially with respect to the longitudinal axis (25) of the piston (1) on the side facing the piston lower part (6) (26) and the piston lower part ( ) Is fitted on the thread (28) of the threaded pin (26) arranged coaxially with respect to the piston longitudinal axis (25) on the side facing the piston upper part (2) A threaded hole (29) with a thread (30), for the assembly of the piston upper part (2) and the piston lower part (6), a threaded pin (26) In the type in which the threaded pin (26) and the threaded hole (29) are arranged so that they can be screwed into the threaded hole (29),
    The threaded pin (26) forms the inner partition of the inner cooling passage (11) and the region (31) covering the inner cooling passage (11) of the piston lower part (6). A multi-part cooled portion used in an internal combustion engine, characterized in that it has a threaded hole (29) and is thinly formed so that it can be deformed into a disc spring shape. Piston.
JP2004557766A 2002-12-06 2003-09-24 A multi-part cooled piston used in internal combustion engines Expired - Fee Related JP4414894B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2002157022 DE10257022A1 (en) 2002-12-06 2002-12-06 Multi-part cooled piston for an internal combustion engine
PCT/DE2003/003170 WO2004053319A1 (en) 2002-12-06 2003-09-24 Multipart cooled piston for an internal combustion engine

Publications (2)

Publication Number Publication Date
JP2006509152A JP2006509152A (en) 2006-03-16
JP4414894B2 true JP4414894B2 (en) 2010-02-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004557766A Expired - Fee Related JP4414894B2 (en) 2002-12-06 2003-09-24 A multi-part cooled piston used in internal combustion engines

Country Status (10)

Country Link
US (1) US6729291B1 (en)
EP (1) EP1583896B1 (en)
JP (1) JP4414894B2 (en)
KR (1) KR101067577B1 (en)
CN (1) CN100339584C (en)
BR (2) BR0310142B1 (en)
DE (2) DE10257022A1 (en)
HK (1) HK1084169A1 (en)
RU (1) RU2313679C2 (en)
WO (1) WO2004053319A1 (en)

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Also Published As

Publication number Publication date
CN1714232A (en) 2005-12-28
KR101067577B1 (en) 2011-09-27
RU2313679C2 (en) 2007-12-27
BR0317030A (en) 2005-10-25
JP2006509152A (en) 2006-03-16
KR20050084180A (en) 2005-08-26
RU2005121255A (en) 2006-06-10
EP1583896A1 (en) 2005-10-12
DE10257022A1 (en) 2004-06-17
HK1084169A1 (en) 2007-12-21
EP1583896B1 (en) 2006-05-17
US6729291B1 (en) 2004-05-04
CN100339584C (en) 2007-09-26
WO2004053319A1 (en) 2004-06-24
BR0310142B1 (en) 2013-02-19
DE50303408D1 (en) 2006-06-22

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